Vishnupurana 3.3.31.p1

3.3.31.p1

iti śrīviṣṇupurāṇe tṛtīyāṃśe tṛtīyo 'dhyāyaḥ

That form of Vásudeva, who is the same with supreme spirit, which is Brahma, and which, although diversified as threefold, is identical, is the lord, who is conceived by those that contemplate variety in creation to be distinct in all creatures. He, composed of the Rik, Sauna, and Yajur-Vedas, is at the same time their essence, as he is the soul of all embodied spirits. He, distinguished as consisting of the Vedas, creates the Vedas, and divides them by many subdivisions into branches: he is the author of those branches: he is those aggregated branches; for he, the eternal lord, is the essence of true knowledge.